working on Haskell part

Author: jonasgeiler

book/SUMMARY.md

@@ -109,6 +109,20 @@
 
   * [Conclusion](languages/golang/conclusion.md)
 
+* [Haskell](languages/haskell/README.md)
+
+  * [Introduction](languages/haskell/intro.md)
+
+  * [History](languages/haskell/history.md)
+
+  * [Advantages](languages/haskell/advantages.md)
+
+  * [Disadvantages](languages/haskell/disadvantages.md)
+
+  * [Some interesting facts](languages/haskell/misc.md)
+
+  * [Conclusion](languages/haskell/conclusion.md)
+
 ## End
 
 * [Credits](credits.md)

book/languages/haskell/README.md

@@ -0,0 +1,6 @@
+# Hi there
+
+> This chapter was made by Skayo.
+
+Welcome to the Haskell part!
+I hope you'll enjoy this chapter.

book/languages/haskell/advantages.md

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+# Conclusion
+
+It's really useful to know Haskell.
+That language seems really underrated by community of other languages.
+It's nice to know more languages and their features beacause no one knows when we'll need specified technology.
+
+## Sources
+
+* [**Wikipedia**](https://en.wikipedia.org/wiki/Haskell_(programming_language))
+
+* [**Official Haskell Page**](https://www.haskell.org)
+
+## Regarding authors
+
+This chapter was made by [Skayo](https://github.com/Skayo).

book/languages/haskell/conclusion.md

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+# Introduction
+
+## Inception
+
+**Haskell** is **standarized, general-purpose compiled purely functional programming language**.
+Haskell is written in several languages,but **it's basically mixture of C and Assembly**.
+This language, was created, by whole team, that included:
+
+* Lennart Augustsson
+* Dave Barton
+* Brian Boutel
+* Warren Burton
+* Joseph Fasel
+* Kevin Hammond
+* Ralf Hinze
+* Paul Hudak
+* John Hughes
+* Thomas Johnsson
+* Mark Jones
+* Simon Peyton Jones
+* John Launchbury
+* Erik Meijer
+* John Peterson
+* Alastair Reid
+* Colin Runciman
+* Philip Wadler
+
+## Features, engineering stuff here
+
+**Haskell** has a lot of features, the most known, are here:
+
+* lazy evaluation
+
+* monads
+
+* type polymorphism
+
+* type classes
+
+* pattern matching
+
+* lambda expressions
+
+* cache in functions
+
+**Haskell** specification is published and open for everyone. **Glasgow Haskell Compiler (GHC)** is it's main implementation, which is both, native-code compiler and interpreter, that runs on most of the platforms.
+
+> File extensions for Haskell code are .hs and .lhs

book/languages/haskell/disadvantages.md

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+# Interesting things about Haskell
+
+## Haskell code compared to other languages
+
+> Example of Hello World code in several languages.
+
+### Haskell
+
+```haskell
+module Main where
+
+main :: IO ()
+main = putStrLn "Hello, World!"
+```
+
+### Golang
+
+```golang
+package main
+
+import "fmt"
+
+func main() {
+    fmt.Println("Hello, World")
+}
+```
+
+### Python
+
+```Python
+print "Hello world!"
+```
+
+### Ruby
+
+```Ruby
+puts "Hello world!"
+```